<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>写入浏览器控制台</title>
</head>
<body>
    <h2>按F12启动 </h2>
    <p>在debugger中选择“console”。然后再次点击运行按钮</p>
    <script>
        console.log(5+6)
    </script>
</body>
</html>